The crushed limestone sand (which is a sand rich in fillers) can be used in concrete as a substitude of roller sand. But, does it affect negatively the shrinkage of concrete?
Crushed limestone sand would be expected to increase the water demand of the concrete for a given workability owing to the relatively high specific surface area attributable to the fine particle fraction. Unless the w/c ratio is adjusted accordingly, we would expect the drying shrinkage to increase, since shrinkage is related thereto. If the cement content is increased to keep the w/c ratio and hence the strength the same, then the increased cement content could also contribute to increased autogenous shrinkage. So yes; we would expect shrinkage to be negatively affected unless extra precautions are taken. Hopefully other commentators with more experience of the material can provide further information.
pl check it.
Article The effects of limestone aggregate on concrete properties
Thank you all for your answers.
When I measured (experimently) the shrinkage, I detect an increase of shrinkage of concrete with crushed limestone sand about 15% when compared with concrete with Roller Sand which confirm the Dr Phil Purnell answer.
Thank you for updating us Saloua. It's nice to be proved right occasionally.
- Badges
- Science topic